React to Http namespace changes.

src/Microsoft.AspNet.Session/DistributedSession.cs

@@ -7,6 +7,7 @@ using System.IO;
 using System.Linq;
 using System.Text;
 using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Features;
 using Microsoft.Framework.Caching.Distributed;
 using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;

src/Microsoft.AspNet.Session/DistributedSessionStore.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Features;
 using Microsoft.Framework.Caching.Distributed;
 using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;

src/Microsoft.AspNet.Session/ISessionStore.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Features;
 
 namespace Microsoft.AspNet.Session
 {

src/Microsoft.AspNet.Session/SessionFactory.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Features;
 using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Session

src/Microsoft.AspNet.Session/SessionFeature.cs

@@ -1,7 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Features;
 
 namespace Microsoft.AspNet.Session
 {

src/Microsoft.AspNet.Session/SessionMiddleware.cs

@@ -8,6 +8,7 @@ using System.Security.Cryptography;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Features;
 using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 using Microsoft.Framework.OptionsModel;